Nathan Barry and Jeremy Olson have put together an excellent resource for anyone looking to get started with app design.

The full package – which includes 9 video tutorials, 9 video interviews, and a handful of resources such as Photoshop files and Xcode samples – is $199 for a limited time to celebrate the launch, and will go back up to $249 soon. The book can also be purchased by itself for $29 (soon $39) or as a middle-ground package that includes fewer resources than the full package.